nios2: Add NIOS2_ARCH_REVISION to select between R1 and R2
Allow user to select between Nios2 R1 and R2. Since R1 and R2 are
not binary compatible, we cannot have a single kernel binary and
there is no point in having DT property for discerning these two.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Ley Foon Tan <lftan@altera.com>
diff --git a/arch/nios2/Makefile b/arch/nios2/Makefile
index e74afc1..38da17e 100644
--- a/arch/nios2/Makefile
+++ b/arch/nios2/Makefile
@@ -22,7 +22,10 @@
LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name)
+KBUILD_AFLAGS += -march=r$(CONFIG_NIOS2_ARCH_REVISION)
+
KBUILD_CFLAGS += -pipe -D__linux__ -D__ELF__
+KBUILD_CFLAGS += -march=r$(CONFIG_NIOS2_ARCH_REVISION)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MUL_SUPPORT),-mhw-mul,-mno-hw-mul)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MULX_SUPPORT),-mhw-mulx,-mno-hw-mulx)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_DIV_SUPPORT),-mhw-div,-mno-hw-div)
diff --git a/arch/nios2/kernel/cpuinfo.c b/arch/nios2/kernel/cpuinfo.c
index 1cccc36..b4a6242 100644
--- a/arch/nios2/kernel/cpuinfo.c
+++ b/arch/nios2/kernel/cpuinfo.c
@@ -125,12 +125,14 @@ static int show_cpuinfo(struct seq_file *m, void *v)
seq_printf(m,
"CPU:\t\tNios II/%s\n"
+ "REV:\t\t%i\n"
"MMU:\t\t%s\n"
"FPU:\t\tnone\n"
"Clocking:\t%u.%02u MHz\n"
"BogoMips:\t%lu.%02lu\n"
"Calibration:\t%lu loops\n",
cpuinfo.cpu_impl,
+ CONFIG_NIOS2_ARCH_REVISION,
cpuinfo.mmu ? "present" : "none",
clockfreq / 1000000, (clockfreq / 100000) % 10,
(loops_per_jiffy * HZ) / 500000,
diff --git a/arch/nios2/platform/Kconfig.platform b/arch/nios2/platform/Kconfig.platform
index d3e5df9..b7ac5b9 100644
--- a/arch/nios2/platform/Kconfig.platform
+++ b/arch/nios2/platform/Kconfig.platform
@@ -52,6 +52,14 @@
comment "Nios II instructions"
+config NIOS2_ARCH_REVISION
+ int "Select Nios II architecture revision"
+ range 1 2
+ default 1
+ help
+ Select between Nios II R1 and Nios II R2 . The architectures
+ are binary incompatible. Default is R1 .
+
config NIOS2_HW_MUL_SUPPORT
bool "Enable MUL instruction"
default n
